/*
 * Copyright (C) 2000-2008 Jens Nixdorf and various contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies of the Software, its documentation and marketing & publicity
 * materials, and acknowledgment shall be given in the documentation, materials
 * and software packages that this Software was used.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.mopore.jat.board;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Graphics2D;

public class HazePainter {

    private boolean showHaze;

    private final float hazeSteps = 20;

    private float hazeIndex;

    private final int screenHeight;

    private final int screenWidth;

    public HazePainter(int screenWidth, int screenHeight) {
        showHaze = true;
        hazeIndex = 0;
        this.screenWidth = screenWidth;
        this.screenHeight = screenHeight;
    }

    public void paintHaze(final Graphics2D g, final Composite origComposite) {

        if (!showHaze) {
            return;
        }

        float base = (hazeSteps - hazeIndex);

        float newAlpha = (base / hazeSteps) * (base / hazeSteps);
        Composite alphaComposite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, newAlpha);

        g.setComposite(alphaComposite);
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, screenWidth, screenHeight);

        g.setComposite(origComposite);

        hazeIndex++;
        if (hazeIndex == hazeSteps) {
            showHaze = false;
        }
    }

}
